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\u5b9a\u4e49\uff1aEnsure a class has only one instance, and provide a global point of access to it.\uff08\u786e\u4fdd\u67d0\u4e00\u4e2a\u7c7b\u53ea\u6709\u4e00\u4e2a\u5b9e\u4f8b\uff0c\u800c\u4e14\u81ea\u884c\u5b9e\u4f8b\u5316\u5e76\u5411\u6574\u4e2a\u7cfb\u7edf\u63d0\u4f9b\u8fd9\u4e2a\u5b9e\u4f8b\u3002\uff09<\/p>

1.\u997f\u6c49\u5f0f<\/p>

\u6b64\u79cd\u65b9\u5f0f\u5728\u5de5\u4f5c\u4e2d\u6700\u4e3a\u7b80\u5355\u5e38\u7528\u3002\u7c7b\u52a0\u8f7d\u5230\u5185\u5b58\u540e\uff0c\u5c31\u53ea\u88ab\u5b9e\u4f8b\u5316\u4e00\u6b21\uff0c\u6240\u4ee5\u53ea\u4f1a\u4ea7\u751f\u4e00\u4e2a\u5b9e\u4f8b\uff0cJVM\u4fdd\u8bc1\u7ebf\u7a0b\u5b89\u5168\u3002\u552f\u4e00\u7684\u7f3a\u70b9\u662f\u4e0d\u7ba1\u7528\u5230\u4e0e\u5426\uff0c\u90fd\u4f1a\u5728\u7c7b\u52a0\u8f7d\u7684\u65f6\u5019\u5b8c\u6210\u5b9e\u4f8b\u5316\u3002<\/p>

2.\u61d2\u6c49\u5f0f<\/p>

\u6b64\u79cd\u65b9\u5f0f\u867d\u7136\u8fbe\u5230\u4e86\u6309\u9700\u521d\u59cb\u5316\u7684\u76ee\u7684\uff0c\u4f46\u662f\u5e26\u6765\u4e86\u7ebf\u7a0b\u4e0d\u5b89\u5168\u7684\u95ee\u9898\uff0c\u6240\u4ee5\u901a\u8fc7\u52a0\u9501\u7684\u65b9\u5f0f\u89e3\u51b3\uff0c\u4f46\u662f\u53c8\u5e26\u6765\u6548\u7387\u4e0b\u964d\u7684\u95ee\u9898\uff0c\u53e6\u5916\u53d8\u91cf\u9700\u8981\u6dfb\u52a0volatile\u5173\u952e\u5b57\uff0c\u9632\u6b62\u6307\u4ee4\u91cd\u6392\u5e8f\u3002<\/p>

3.\u9759\u6001\u5185\u90e8\u7c7b<\/p>

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4.\u679a\u4e3e\u65b9\u5f0f<\/p>

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